Apentix/AP Chemistry/Unit 5: Kinetics/Question
AP Chemistryeasymcq1 pt

Which statement correctly distinguishes the rate of a reaction from its rate constant k?

A.The rate changes as reactants are consumed, while k stays constant at a fixed temperature
B.Both quantities fall steadily as the reaction proceeds
C.The rate constant grows as more reactant is added to the vessel
D.The two quantities share no connection through any equation

Explanation

Core Concept

Rate depends on both the concentrations raised to their orders and on k, so it slows as reactants are used up. The rate constant depends only on temperature and on whether a catalyst offers a new pathway, not on concentrations. Two runs of the same reaction at one temperature share a single k even when their instantaneous rates differ. That separation is why k is called a constant while rate is not.

Correct Answer

AThe rate changes as reactants are consumed, while k stays constant at a fixed temperature

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